Question: Mention the person responsible for heading the chairperson-ship of Social Democratic Party of Germany
Paraphrase: Specify the individual capable for heading the chairperson-ship of Social Equitable Party of Germany
SPARQL (Wikidata):  select distinct ?obj where { wd:Q49768 wdt:P488 ?obj . ?obj wdt:P31 wd:Q5 } 
Answer: Norbert Walter-Borjans, Saskia Esken